Bug#913781: reprozip: Script accesses internal dpkg database

[Rémi Rampin]

Upstream developer here. ReproZip needs to match from filename to package,
not the other way around. It formerly used `dpkg-query -S FILENAME` to do
this, but this was switched to reading the database directly for
performance reasons (exact commit is
https://github.com/ViDA-NYU/reprozip/commit/b085c41035959a451d77b0defa8c8b4ba025f47e).
When many files need to be looked up, it is more efficient to do a single
read through the info/*.list files than to do many such queries.

If I am missing a fast way to do this using the correct external interface,
please let me know, and I will gladly update the code.

A change in the database format could be a problem, thanks for letting us
know.

Best
Rémi
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